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Question 264 - DBS-C01 discussion

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A company plans to use AWS Database Migration Service (AWS DMS) to migrate its database from one Amazon EC2 instance to another EC2 instance as a full load task. The company wants the database to be inactive during the migration. The company will use a dms.t3.medium instance to perform the migration and will use the default settings for the migration.

Which solution will MOST improve the performance of the data migration?

A.
Increase the number of tables that are loaded in parallel.
Answers
A.
Increase the number of tables that are loaded in parallel.
B.
Drop all indexes on the source tables.
Answers
B.
Drop all indexes on the source tables.
C.
Change the processing mode from the batch optimized apply option to transactional mode.
Answers
C.
Change the processing mode from the batch optimized apply option to transactional mode.
D.
Enable Multi-AZ on the target database while the full load task is in progress.
Answers
D.
Enable Multi-AZ on the target database while the full load task is in progress.
Suggested answer: B

Explanation:


https://docs.aws.amazon.com/dms/latest/userguide/CHAP_BestPractices.html#CHAP_BestPractices.Performance

For a full load task, we recommend that you drop primary key indexes, secondary indexes, referential integrity constraints, and data manipulation language (DML) triggers. Or you can delay their creation until after the full load tasks are complete. You don't need indexes during a full load task, and indexes incur maintenance overhead if they are present. Because the full load task loads groups of tables at a time, referential integrity constraints are violated. Similarly, insert, update, and delete triggers can cause errors, for example if a row insert is triggered for a previously bulk loaded table. Other types of triggers also affect performance due to added processing.

https://docs.aws.amazon.com/dms/latest/userguide/CHAP_BestPractices.html

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asked 16/09/2024
Sebastian Gryza
40 questions
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